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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c75210689a5e93670bcecef2a4d11415139eb68a43f5df5a3fdea4486c429bb4' 
  AND token = 'MQpfznWydAiiRmLKdN3K6VrfAlFFHLeD9FKGouqWT7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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