SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d07100ca5748d3af88af61db1506af76a6b2cff1b9aec6aac3f05e2a80e2ef4' 
  AND token = '8sBZ8+zowYValJUC6gDd7/XTtYz9deEOigHvaESqhSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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