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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8089ca2cbe359be7c13d84f983637b4e34d83fa35813a5f7eea4d110ae220140' 
  AND token = 'wUE0iOFTVrtYRQZR4m9xTs95oY607hVT/2SOwmCcDlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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