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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5839bf83cb4192d248759bc76b210304e2448f6a48b9feeb45fccc816f5bff23' 
  AND token = 'NUA6+Q6kBAH2Aqmltsuuy41+5tPP25T1ztcRTz7TQxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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