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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5751d1084feee6a68eae735137336104979450fcdeac6799464cb7c981ce4228' 
  AND token = 'xTNajw0DBce3M/fL6PD0850v4EPoSgpvAyr0OviDX1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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