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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '969c9b2b3028898833f419b1cdc894f55cac16472b265be67de21bc05c9bbbb8' 
  AND token = 'HdDM1O5ApEzMnTyQRio4Ou4LatMrPJzcEJcYe4doTEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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