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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17aef9b370ec630bc5c7af8f0f6ccbb19e549e85f4acea658b6f51176575e2fe' 
  AND token = 'n2sknxDo+aONq5fxplGbKX2BZDO8tEqRaQq6AUAGQoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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