SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63aebb3a8fa90ef9b3e48f2ae3812eb73005bded58f577715ab295a090e191d8' 
  AND token = 'JVtrqGHWrGql0K3IJ4WNpOvku38Zh+XAg77RpPrLIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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