SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7307b4c42f9111b944e311ce8e5d3c0a678f55630e5064945a7b7b5ba224fa0e' 
  AND token = 'W2Z9IoDso9Xq4FX2wqbKj7Ga+J/81ZYzUqzdSTATfeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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