SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd15c91a35a4a6a34b1ed1e5535482f6f7b0e46b87bb4f886909e5a2d32b4bc6b' 
  AND token = 'h2BfHdZqlsPk9WyTxFX4tK8aCiJCj8PqY6SO+T3ACxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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