SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4044911231ac949478da2f7fae71f09396dd4dcce8899febb54a0f416bbdd225' 
  AND token = 's6BVxSPwNqT/xD0OUVTHovjct+p15hY/DFTmcnU46KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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