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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a50f13238bb46c054c61584d410d17074a35c04fdc8c230e71ee228de4cc514' 
  AND token = 'WBspo8ffTFxAqGY7nSmafela7sf37fbKtxpXONO3fiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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