SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6357444de31b0ac88d410d911d97de3c9f3fa6aabf4bbfc852529babf6f707e4' 
  AND token = 'xrnlSJuVyzk9wO7n1ktkz6qIHC9I1F2vLuYwZoIBi6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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