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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd1ca645377dc015a76f9a320a4bd5e28c92b81f0400787a63bf90aacc9fed58' 
  AND token = 'tYCm21gRpJy3SbJ6lLNgjNMJouyjerIeFlPxjcE3W2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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