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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '598ba6a42023d316e10e0ba18afcc9eb12e8e54efd91d61f573e07ec3a7c82b9' 
  AND token = 'n0KfKSiFab8p28cBfemdHrMcknCUrnVRnYiNGQQDKdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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