SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61c4ebe6c3ba4e5203fe2c45e9a35d2279efa308850ca1b269dd17ea92f28d7e' 
  AND token = 'zDSV3sUUO6uj03Lzqj5nwuvpSvTm6CqGbCGzN5LXKM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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