SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '404057ac0aa75c4e967b56ebf66f8591fc126283ffe93992b5c218d85bee98c9' 
  AND token = 'yHHoNwuHWWBOej7jZwuXPxmNsr+rg5hjZELxfZVkW1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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