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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd41ccf73bc9e8a106141ee441ac5eebb1c75422e8b3da3a9cb48ddbfce13e8e0' 
  AND token = 'Jfeg00ONQN09WgudDrYjr1cyVYv3MWVuCYMN+o7sSYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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