SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db96ac1f035015603447f7573e7a9a483c5b27f81583da45762ab1d7eb1f094d' 
  AND token = 'C/mPmO5ir1SDnBjaPwlkPuEKmXyw1f0xp9GFvW60WIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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