SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c8d80441a7d14e86edf7c2f52bfaf7e0c013fdb04277f0f9e3a96d5a6670bc' 
  AND token = 'AGr/l5bqEn7JBjktHJ1iN9BzCyUXjx3WWXDJL5MWqVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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