SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '004456a832565e10ba59dd008b420ca9d871112b4ca7856e4946f864c29eb8ac' 
  AND token = 'pChJ8e2vOPkmBgIhwszwVBLbYUAJP0aw8x7jbF3G9+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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