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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8696338d986c63a8116a7863d8265e9b85a63d988c52e9909e400b49896b63a6' 
  AND token = 'quJ2wnU6y745A9P0/YQi0k95WnOBmTmMmyOZWB20l7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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