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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef90beb03a90e1e93b48d9ed8f91d6325233ec2b6cece7684bab27592113f30' 
  AND token = 'jLli5RAUHt/s/zxUDO9lK4g2+68gku+Zf6AfNSzyD8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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