SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0a2b618cb61891e423002c6e5f7cd704c134051f8a9323691ebfa569f381fd0' 
  AND token = '1F8RcJAV/AuyKTcSuKLtDoSwVqUzCQo4Cbv0zPepD2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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