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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a55e857c01eab5e8df3cc1c2d02f79707c29ba2a75526ff3479a79634e0add4' 
  AND token = 'RHyghMs3Me4qvQ8hr9RFTK3U1FRqEGtj8FL8qgTGKWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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