SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16c787491e60111ba48457bf163b8e82787c1ceed3e4f258018920b148f0bb9c' 
  AND token = 'F96OmdHGUHfOt1FwJEqVj/8itBWLvtxurOqQ0kZo7JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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