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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd838caad1524ed6757ae778269a9e0edb725eba85e5c5e07bce07813b5a9f59e' 
  AND token = 'HUf0af4ApgkES+Mt2X0bVmNmkYIj9Qaxh/MVJkW5DpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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