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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd6271b0902ebb70a70e88de71d0743127bfb909728d1dd0fcdd34e840e97af7' 
  AND token = 'wD5QaPEnCESbBoB77ckVdadEFI316Q+ieQR5Tx0otSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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