SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5157ab63a81aa1bf5838e83de40b6a14969ea450181f2f4d49220945705c7670' 
  AND token = 'XNGIdVyy+dif2fKsUzhiGOtPaheK3xSSHBnahAYJgy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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