SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d0e39a2caab3dcc8269c95a06bb781f84336ac09dd19c052bf83616ed84c9d' 
  AND token = '09GV1wv+WpkjDWn2466BAPfzODFl7IW0B8qXHhmJer0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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