SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82235b2c1ad339f6e4de88bf7ce0a2d782db249702d6ae55152dd4384776aa6c' 
  AND token = 'Y5qgtbmSLiUSCWqlNR9dYYn8TyoLKQWVjlYpIOmJi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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