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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '742ccba4c7c439fa9da6948dfcc42e154d2fe12a2792ce396661af5d7e81f91c' 
  AND token = '22rLX9VXg1r4zCpZZQ46eml5v3b7g7x8wrTUD74vWf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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