Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5910a990fb33155deaa41de8874fb62dec554259f9a65d13c5a807a81e1bde2' 
  AND token = 'reTL7KXUoQvsulcz37vJ7BsRyA2g0fukIM4oVa93xs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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