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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0dced21ead83e5dd0aa596aa56de90eee879bd80f0c4e293ef63fee6cc6d27c' 
  AND token = 'sOP5VEocCDMGr323PZ1NlRB5vcVCRSBNt2ZAWqLhNGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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