SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd343e0e476087b2b816ea182a94925153d609c07b5811f5132657187f784a6b' 
  AND token = 'TaTo8Zn1RJvmvweQkt0Q9of2MLLxl/YVwp7CxuAGEuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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