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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c7fe2dbe6c523372c95a95fa35d7d2b2c7c8980112ad5d2ad33b0701303c949' 
  AND token = 'FTqSOPeWxRa+B0zApzbfK6Ox9IcIRD+UltEbP2MVZ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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