SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6026b8695b5aec249ad568beaf31503b923bce8a6c28cc9d9e1f272b3e72f5eb' 
  AND token = 'LMOuCJ6wyK6JDV5nxAiGvtLrfV1747q78GZZXhyfHqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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