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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '482c6154d78a6d6d6e02ea9a54a274dd7f5367544f149d2cc0ebbc63644c91d4' 
  AND token = 'vucHyt21w7fJw6g05YN/OY41kkpu/K70TzVT5caRGxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}