SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233172d54ab8319c727d549f2999238e044267d3d7008f24feee721e852841e3' 
  AND token = 'ddYSWZPWlpBWalYxJKsZXDmjygGOg17Zxgz6yzc4gRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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