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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e62973d5c098886363f77a04a2d6741f0c692384593553b96e78e28b17fdd054' 
  AND token = 'nCvkrXCUOnxd9W6lJNVoBrG6kMos2n51Sn1nU2XbDlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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