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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0430a592607cbe02819ffe2e6f0c59e429cef6337e81f48cfa4408e46eb75e93' 
  AND token = 'yHwCKX4iAhM95wEs129SUIp8XLk0Jhm7a/FVcw4lgXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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