SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ca9b7c37a7f45166c2065a8add0af4cfbcfb8708df7fd57db4cf225462476e' 
  AND token = '2jUCguseiHDqnW2svrrS9BK3T/Z5Uv3jXBYFXki9pLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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