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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b55cc8857f1942e15ca4f718684dba530798448b2f0308a45c8a6181718b0f' 
  AND token = '7a2mdr6lqg5/0STJ5BhxdUcNVN4y68xKa4cd4c+nrzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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