SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e9f5dc3a9f4d9d2324a54c7522f1c7a24e69f2f076bc296e90458a3cca30e1e' 
  AND token = 'zYsbSw88lC3CVPjAIuNdcqBrv0XLuLzTGCujJnUt/do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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