SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7a430f76238c30c57105a03297a6567b0ae3d5684b58e61ad4bfbc803f64de7' 
  AND token = '8t1LUSYJhSNBmQ6luvCqRi0ByBV1qrpv0SOXaqjDegs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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