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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '321165ad39a6243a83c7ea442ce8e78a959f1abe801444f5e6d553724d7b8bd8' 
  AND token = 'VlKYNuf5NbAdm/3daUD0ASD63hPIDFCL7+xh/CiJBpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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