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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f3ea9559a9a31f3871e2bffd2fe167fd5b31d3742bd44a9ca2d745a7114551b' 
  AND token = 'wfheX3i7jfJ/XN4fMps11g2UQfRHLCqSWAVAeyYuQIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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