SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c66ae4e37731e3263ca4eafa12755601cd2bd2e289b4c0c724b9dc45d0d5754e' 
  AND token = '/oJgsYTQR+Gz7KetsF54TL1xwNvYy21CVKFmA2tBeMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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