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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f23c9c6e8f4e9f7076c19844e7d12fd3cc1b646315cdd71b71d15d49ff3a570c' 
  AND token = 'GKIZ9u6GNGS0HALa6vOTt/EmlsGIFTmKnyAWZ5iZm8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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