SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f50d5ed60f30b06ad16042d93d4650b6b987376823d86f164fffb590124244e' 
  AND token = 'hLZ5zbWwdiyYAUVvGlNt+cCYkqJXPnShOhfKpzy8kVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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