Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa4b008dee94a771c66088ea54361d5f9504e8189593b5efffdd12a1510bac5' 
  AND token = 'he/hut8RE7EoeUsshF3pzITm7TAna1hQPBJclGbxggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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