SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10e4c09fca3d7c377a9a840ab7690aa7e4dfa21c474bd996d85b2ca63d9eca48' 
  AND token = '2GhEdKRmmldSJFMoLohkvpBUFGKdtzY/zpLJYGiJONQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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