SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cb914164d0e6caab20f1c52594912d8465ef786c812de5ca33e1ae1d32321d4' 
  AND token = 'V23HffEcVj/ZKZF6dg9BeD4UJEMUpcz+KZPg7fRY8Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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