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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '056e8ac008489d5eddea3f659efb94dbc9c0d849bbd0338002c4b05be76ad661' 
  AND token = '3/yMFol+V0mAsCaFn2O8HGh88/v+qWlvc9T6mdOW0MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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