SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1637f802135d8a6aef923961a20a42a5fcc3c23f5745bd1cd74132e7ddac71ba' 
  AND token = '366LNMKuWwarvqx/dLmquQxjkGgwCjHW0Mtcr+yBHHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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