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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '870fe6072106e2d52f957bfd2ed0d9979c8090f30155dbbba8b4c37385ce65d9' 
  AND token = '0et4xyEj6TRy9gsoqxxoO0DvKTVnVX3wIB1i+evXvs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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