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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5953e3d5fa74e5a805aac6eb5222a723699a876fed5b1e92637c7af0cf2c3a3' 
  AND token = 'xiZxSyDBCQE066sMoqVmSNRRXgLfkej/5YEvZE1xk2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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