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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1adbdff57dc89e70c954754823bc1be26057306b720d17cb9a9d5162123d0c1f' 
  AND token = 'dZKveMGYwsf9AG0wk8dYcgrufkDR/+gHFsZao0cbtR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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