SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8be202c237203cf7e854fa3364ab1b012adf8ccb1891f47f95976e9e45a6465' 
  AND token = 'C1dR8xaSeqhDnPqhjxm7V5cBW+WyYslkP2BaZXEXc6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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